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Search Results: 1 - 10 of 225298 matches for " Donald C. Craig "
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Kai-Xian Zhu,Donald C. Craig,Andrew C. Try
Acta Crystallographica Section E , 2008, DOI: 10.1107/s1600536808026226
Abstract: The title compound, C15H10Br2Cl2N2, a 2,8-dibromo-4,10-dichloro Tr ger's base analogue derived from 4-bromo-2-chloroaniline, has a dihedral angle of 110.9 (10)° between the two aryl rings, the largest yet measured for a simple dibenzo analogue.
Comparison of fish assemblages in two littoral habitats in a Neotropical morichal stream in Venezuela
Monta?a, Carmen G.;Layman, Craig A.;Taphorn, Donald C.;
Neotropical Ichthyology , 2008, DOI: 10.1590/S1679-62252008000400005
Abstract: morichales are lowland streams in south american savannas with riparian forest dominated by the moriche palm (mauritia flexuosa). we sampled littoral habitats from ten flooded vegetated patches (dominated by mauritiella aculeate) and six sand banks in two months of the dry season (feb-mar 2005) in a stream in the savannas of apure state, venezuela. we collected samples that compromised 12,407 individual fishes of 107 species. small-bodied fishes (< 100 mm), representing diverse trophic and life history strategies, were abundant. the most abundant species were in the families characidae and cichlidae. fish assemblages from flooded vegetated patches differed significantly from those on adjacent sand banks. high structural complexity along vegetated shoreline habitats of morichal streams likely contributes to species richness and affects assemblage composition.
2,8-Dimethyltricyclo[,9]dodecane-syn-2,syn-8-diol–propanoic acid (1/1)
Yuji Mizobe,Roger Bishop,Donald C. Craig,Marcia L. Scudder
Acta Crystallographica Section E , 2009, DOI: 10.1107/s1600536809016547
Abstract: The racemic title compound, C14H24O2·C3H6O2, crystallizes in the monoclinic space group P21/c as a 1:1 diol/carboxylic acid cocrystal, A–B. The lattice incorporates infinite chains of the alcohol–carboxylic acid–alcohol supramolecular synthon, (...O—H...O=C(R)—O—H...O—H...), in which the hydrogen-bonded molecules (A—B—A)n surround a pseudo-threefold screw axis. The carboxylic acid group functions like an extended alcohol hydroxy group. Each diol, A, takes part in two such threefold screw arrangements, leading to a hydrogen-bonded layer structure, with adjacent layers containing diol molecules of opposite handedness. The central C atom of the propano bridge is disordered over two sites of occupancies 0.75 (1) and 0.25 (1). The methyl group of the propanoic acid molecule is disordered over two sites of occupancies 0.68 (1) and 0.32 (1).
Jason Ashmore,Roger Bishop,Donald C. Craig,Marcia L. Scudder
Acta Crystallographica Section E , 2008, DOI: 10.1107/s1600536807061235
Abstract: The racemic title compound, C27H26N2O4, crystallizes with its central carbon bridge on a twofold axis. It forms parallel chains of molecules utilizing aryl offset face–face interactions with an interplanar distance of about 3.5 . These chains associate further by means of pairs of O—CH2—H...π (with H–ring distances ranging from 2.69 to 2.95 ) and O—CH2—H...N motifs. The methoxy groups in this structure are coplanar with the aromatic rings to which they are attached. This is recognized as being common behaviour amongst aromatic methoxy compounds.
Development and validation of the multidimensional role conflict questionnaire
Craig Donald,Fiona Donald
South African Journal of Industrial Psychology , 2001, DOI: 10.4102/sajip.v27i2.779
Abstract: Role conflict has typically been measured in a unidimensional manner despite its original development as a multidimensional construct and indications that evaluating a number of dimensions may be more useful in a research and diagnostic context. This study addressed the need for a multidimensional scale, the Role Conflict Questionnaire (RCQ) to address some of the limitations of a unitary measure. Opsomming Ten spyte van die feit dat rolkonflik oorspronklik as n multidimensionele konstruk ontwikkel is sowel as verskeie aanbevelings dat die meting van verskillende dimensies meer bruikbaar is in beide navorsings- en diagnostiese verband, word dit steeds tipies eendimensioneel gemeet. Hierdie studie spreek die behoefte van n multidimensionele skaal aan. Die resultaat is die Rolkonflikvraelys (RKV) wat die beperkings van die enkelmeting aanspreek.
Paul D. Ahn,Roger Bishop,Donald C. Craig,Marcia L. Scudder
Acta Crystallographica Section E , 2009, DOI: 10.1107/s1600536809014408
Abstract: The achiral title compound, C6H4Cl2O2, crystallizes with O—H...O hydrogen bonding linking molecules into layers. Between layers there are chains of Cl...Cl...Cl interactions with alternating distances of 3.274 (2) and 3.742 (2) . Augmenting this arrangement there are also C—H...Cl (2.97 and 3.17 ) and Cl...π (shortest distances 3.40 and 3.54 ) interactions.
Paul D. Ahn,Roger Bishop,Donald C. Craig,Marcia L. Scudder
Acta Crystallographica Section E , 2009, DOI: 10.1107/s1600536809004310
Abstract: The achiral planar (maximum deviation 0.014 ) title compound, C10H6Cl2O2, crystallizes in the chiral space group P212121 in an arrangement incorporating conventional O—H...O hydrogen bonding leading to a supramolecular chain.
Vi T. Nguyen,Roger Bishop,Donald C. Craig,Marcia L. Scudder
Acta Crystallographica Section E , 2009, DOI: 10.1107/s1600536809009933
Abstract: The racemic title compound, C23H28O2, crystallizes in the space group C2/c as a layered structure in which a centrosymmetric three hydrogen bond sequence links four molecules. Both hydroxy groups are involved in this arrangement, but they differ in that one participates in two hydrogen bonds while the other takes part in only one. Between layers, the aromatic rings take part in edge-face interactions [shortest C—H...C distances 3.04, 3.10 and 3.12 and angle between normal to planes 86.7(2)°], forming a centrosymmetric dimer. The lattice is further stabilized by C—H...π interactions involving both methyl (shortest C...C 3.82 and 3.97 ) and methylene (shortest C...C 3.60 ) groups.
(3R,4S,5S,8S,10R,13R)-3-Hydroxykaura-9(11),16-dien-18-oic acid
Karren D. Beattie,Mohan M. Bhadbhade,Donald C. Craig,David N. Leach
Acta Crystallographica Section E , 2012, DOI: 10.1107/s1600536812002206
Abstract: The title compound, C20H28O3, was isolated during our investigation into the chemical composition and pharmacological activity of Centipeda cunninghamii (DC.) A. Braun & Asch. (Asteraceae). The enantiopure compound, a diterpene with a carbon skeleton, is composed of three six- and one five-membered rings in chair, twist-boat, half-chair and envelope conformations, respectively. Each molecule makes one intra- and one intermolecular O—H...O hydrogen bond in the crystal lattice, forming hydrogen-bonded chains along [010]. The absolute configuration of the compound was assigned on the basis of optical rotation measurements.
Tetraphenylphosphonium hydrogen oxalate
Philip A. W. Dean,Donald C. Craig,Marcia L. Scudder,Ian G. Dance
Acta Crystallographica Section E , 2008, DOI: 10.1107/s160053680706463x
Abstract: In the title compound, C24H20P+·C2HO4 , two symmetry-independent ion pairs are present. The cations aggregate into puckered sheets via zigzag infinite chains of sixfold phenyl embraces and parallel fourfold phenyl embraces, while the anions form hydrogen-bonded chains between the sheets of cations. In the two independent oxalate anions, the angles between the normals to the two least-squares carboxylate COO planes are unusually large, viz. 72.5 (1) and 82.1 (1)°.
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